Early years He began coaching as a defensive assistant and special teams coach for the
Tampa Bay Buccaneers under coach
John McKay in 1984. He then spent three seasons at the
University of Illinois, first as a graduate assistant and then a defensive line/special teams coach, and two years at
Purdue University.
NFL Kollar began his NFL coaching career as the defensive line coach for the
Atlanta Falcons in 1990. He spent more than a decade (1990–2000) coaching the defensive line for the Falcons, highlighted by an NFC Championship in 1998 and an appearance in
Super Bowl XXXIII against Denver. Kollar then spent five seasons coaching the defensive line in St. Louis. Kollar’s defensive line was instrumental in the Rams’ 2001 Super Bowl run as the club ranked third in the NFL in rush defense (85.9 ypg) while tying for the seventh-most sacks (45) in the league. Kollar then spent three years coaching the defensive line in Buffalo (2006–08), where he coached future All-Pro defensive tackle
Kyle Williams and two-time Pro Bowl defensive end
Aaron Schobel.
Houston Texans Kollar joined the
Houston Texans in 2009 and spent six years there, including his first five years as assistant head coach/defensive line. During his tenure with the Texans, the team ranked eighth in the NFL in total defense (329 .4 ypg) and third in the league in opponent third-down percentage (35.9). Kollar’s unit adjusted to the defense’s transition to a 3–4 scheme in 2011 under Houston Defensive Coordinator
Wade Phillips. The Texans went on to post the third-largest defensive turnaround (−91.2 ypg) in NFL history in 2011. Defensive ends
Mario Williams,
Antonio Smith and
J. J. Watt combined for five Pro Bowls playing for Kollar in Houston.
Denver Broncos After the 2014 season, Kollar left the Texans and became the
Denver Broncos defensive line coach, where he reunited with
Gary Kubiak. On February 7, 2016, Kollar was part of the Broncos coaching staff that won
Super Bowl 50. In the game, the Broncos defeated the
Carolina Panthers by a score of 24–10. ==Personal life==